Select the correct passive form of the given sentence.
"They might be repairing the engine now."

Correct option is C

The correct passive voice of the given sentence is (c).
Explain the rules of conversion from active to passive with structure in detail.
· Identify object → the engine (object) becomes the subject in passive.
· Modal + progressive in active ( might be repairing) becomes modal + be + being + V³ in passive.
· Keep adverbials (“now”) in place unless repositioning is required.
· Structure:
· Active voice: Subject + modal + be + V-ing + object (+ adverbial)
· They might be repairing the engine now.
· Passive voice: Object → Subject + modal + be + being + V³ (+ adverbial)
· The engine might be being repaired now.
Why other options are incorrect:
· (a) might be repaired → simple/passive state, but loses progressive aspect (“be being repaired”).
· (b) may be repairing → treats “engine” as agent performing repair on itself (semantic and structural error).
· (d) might repaired → missing be and being; ungrammatical.
Information booster: Although “be being” can sound awkward, it is the correct grammatical marker for the progressive passive (e.g., “is being built,” “might be being checked”).